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Assessment of Finger forces and Wrist torques for functional grasp using new multi-channel textile neuroprostheses


M. Lawrence, G-P Gross, M. Lang, A. Kuhn, T. Keller

Artificial Organs, vol. 32, no. 8, pp. 634-638

New multi-channel textile Neuroprotheses have been developed which comprise of multiple sets of transcutaneous electrode arrays and connecting wires embroidered into a fabric layer. The electrode arrays were placed on the forearm above the extrinsic finger flexors and extensors. Activation regions for selective finger flexion and wrist extension were configured by switching a subset of the array elements between cathode, anode and off states. We present a new isometric measurement system for the assessment of finger forces and wrist torques generated using the new neuroprostheses. Finger forces (from the middle phalanxes) were recorded using five load cells mounted on a ‘grasp handle’ that can be arbitrarily positioned in space. The hand and the grasp handle were rigidly mounted to a six degree of freedom load cell, and the forces and torques about the wrist recorded. A vacuum cushion was used to comfortably fixate the forearm. The position and orientation of the forearm, wrist, fingers and handle were recorded using a new 3-dimensional position measurement system (accuracy <±1mm). The measurement system was integrated into the real-time multi-channel transcutaneous electrode environment which is able to control the spatiotemporal position of multiple activation regions. Using the combined system and textile neuroprosthesis, we were able to optimise the activation regions to produce selective finger and wrist articulation, enabling improved functional grasp.


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M. Morari

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% Autogenerated BibTeX entry
@Article { LawEtal:2008:IFA_3138,
    author={M. Lawrence and G-P Gross and M. Lang and A. Kuhn and T. Keller},
    title={{Assessment of Finger forces and Wrist torques for
	  functional grasp using new multi-channel textile
    journal={Artificial Organs},
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